Some says AIO-3399J cannot connect adb , this post for this problem. Update Firmware below to fix it. 1.fixup AIO-3399j adb connect. 2.fixup some problem about video decoding. 3.connect to PC add a memery status. 4.support ordinary driver about usb2uart. 5.fixup the virtual keyboard always showup after insert the physical one.Firmware DownloadIf do not overwrite the system image , can download the patch to fix itdrmservice.rar(10.79 KB, Down times: 9)

2/8/2018 10:51 Uplaod

Click on the file name to download attach

Copy the patch file under /system/bin/ from your UDisk with usb2uart module or some file explorer to do it (root will be needed), and soft reboot endSerial Command to do:sumount -o rw,remount /systemcp /mnt/media_rw/U-Disk/drmservice /system/bin/reboot